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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0374bcd551696c0d940b08feba01b8592a39ce85fb129c743f535d2d67e40b' 
  AND token = 'hxzWenrAxePAlY5L0A8EbsIh007l5d1aHh6tkPNjoJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}